Compilare: user.cpp: In function ‘int main()’: user.cpp:18:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (unsigned long int i = x; i <= x + h - 1; i++){ ^ user.cpp:19:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (unsigned long int j = y; j <= y + h - 1; j++){ ^ user.cpp:13:8: warning: unused variable ‘k’ [-Wunused-variable] int k = 0; ^ user.cpp:15:22: warning: unused variable ‘i’ [-Wunused-variable] unsigned long int i, j; ^ user.cpp:15:25: warning: unused variable ‘j’ [-Wunused-variable] unsigned long int i, j; ^